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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3faa319623c14e4f8723db85958baf92ef383b641251b1ff5e0b709f2e7e26c7' 
  AND token = 'wJTV9LgqDxJ1VtbA7XEbdc6laGfmGH73RhsZNQ8N4FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}